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Circuit Review

s1buell

  I`m currently making some proto circuits and I would love some feed back/Ideas etc.

 

All these circuits will connect to Arduino or Arduino compatible devices.

 

Anyone have time to help out with some reviews?

 

First circuit is a 4-20ma board

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  • in reply to s1buell

    Tom,

     

    Again, I am not sure that you can count on the second leg of the 4-20ma loop to be at ground potential.  You might end up shorting out a driver or introducing ground noise into the circuit.

     

    Here is a link to some information on the risks of assuming a ground potential on the low side of the loop.

    https://www.dataq.com/blog/data-acquisition/4-20-ma-current-loop-measurements/

     

    Also, not all 4-20ma loop devices are actually supplying current.  There are passive devices that act as a variable resister, and the measuring circuit actually supplies the drive.

     

    On the outside simple.  But potentially quite complex.  If you know the devices that you will be receiving from, then you can make some simplifications to the measuring circuit.

     

    Gene

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